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John Orozco competes on rings during the men's senior division at the U.S. gymnastics championships on Thursday, June 7, 2012, in St. Louis. (AP Photo/Jeff Roberson)

The major U.S. Olympic trials are under way through July 2 in preparation for the London 2012 Olympic Games. Live coverage of many events can be found on the NBC Sports Network, and selected videos will appear on NBCOlympics.com. Here's what you should watch Thursday, June 28:

The event: Gymnastics: men's competition.

When: 5.30 p.m. to 8 p.m. ET, June 28, NBC Sports Network.

Where: HP Pavilion in San Jose, Calif.

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Ones to watch: There are six events in men's gymnastics - floor exercise, pommel horse, still rings, vault, parallel bars and horizontal bar. With only five spots on the Olympic team up for grabs, it'll be a test of all-around competence and strength for the men today. There may be no room for those who specialize in only one or two of the exercises.

John Orozco comes to the trials fresh off his first U.S. all-around champion title and will be hard to beat if he maintains his current form. Orozco, who hails from the Bronx, N.Y., began gymnastics after becoming a black belt in Tae Kwon Do. "My father realized I could do more because I was strong as a young child," he told USA Gymnastics. "He would see me doing flips and splits and decided to introduce me to the sport." His favorite events are the high bar and parallel bars.

What happens: Five men and five women will be chosen to represent the United States in men's and women's gymnastics at the 2012 Olympic Games. For the men, two athletes will be identified following the conclusion of the second day of competition, with the remaining members announced July 1 in conjunction with the women's final session.

For women, the individual all-around champion at the conclusion of two days of competition at the trials will automatically make the Olympic Team. The remaining four athletes will be determined by the selection committee and announced on July 1.

Ones to watch: Allison Schmitt has emerged as one of the country's top freestyle swimmers. She earned a bronze medal and an American record in the 800m freestyle relay at the 2008 Olympic Games. Schmitt, 22, also placed ninth in the 200m free in Beijing and will be hoping to better that placing today in the same event at the team trials. From Canton, Mich., Schmitt is enrolled at the University of Georgia where she is majoring in psychology with a minor in child and family development.

Sounds serious, but first impressions can be decieving. According to Swimming World, Schmitt possesses an easygoing nature and is seemingly unfazed by pressure. "I guess it's just my personality," Schmitt said of her approach to the sport. " I don't like to take things too seriously. I just like to have fun. Especially in a sport like swimming. You have to keep the mood light, joke around, play games and have some fun."

What happens: The fastest two swimmers in each individual event earn a place on the U.S. Olympic team bound for London.

One to watch: Lance Brooks, 28, goes into today's men's discus final with the best throw of the qualifying session by nearly two feet. Brooks - who hails from New Berlin, Ill., stands 6-foot-6, weighs 270 pounds and wears size 17 shoes - admits that the sport isn't lucrative enough to be his living, so he works construction jobs in Denver in between training at local high schools around the city. "Concrete laying. The hard work," is how Brooks describes his day-to-day work activities to the Chicago Tribune. "It's probably not the ideal job to have as an athlete, but it pays the bills and you've got to do what you've got to do."

What happens: The top three athletes in the each individual event will qualify to make the Olympic team and journey to London.